The dropdown menu for Search Builder sucks. Usual MS - Let's try and make things more difficult than necessary, by requiring additional clicks.
And why call it anything other than "Advanced Search"? To give people actually what they are looking for would be too simple. Let's call it "Search Builder" instead.
And then, why have a Help page for search? Much better to have cryptic notes spread all over the place, for just some of the search options - this way we can be certain that searchers can get even more confused and waste even more time.
I think it has great potential - it's just a pity that these issues exist